stereo_pprc: Fix for optimal threshold
Timeout for stereo correlation
tif_mosaic: More robustness
parallel_stereo: make verbose arguments non-optional
point2dem: Format a bit
Common.h: Add function to write image with nodata and 1 thread
Orthoproject: Bug fix for nodata values
orthoproject: Fix compile issue
point2las: Create output directory
StereoSession: Export newly found session string
XML: Catch exception on invalid read
RPCMapTranfsform: Abstract away the model
orthoproject: Rm duplicated functionality
rpc_mapproject: Support DG model
Bring orthoproject and rpc_mapproject closer with view of merging them
Core: Add validator for Vector2

This is not used anywhere in ASP at the moment but I use it in outside
test code.
tools: Playing around with aligndem